在页面帖子类型中显示元框下拉菜单(来自自定义帖子类型

时间：2018-02-25 作者：Danny

我正在尝试向“页面”帖子类型添加一个元框，我成功了。在我的元框中，我想显示一个下拉列表，其中包含来自其他自定义帖子类型（名为“Albums”）的标题。我也成功地做到了这一点，但一旦我在下拉列表中选择了一个特定的专辑并保存了页面，它就会将页面永久链接更改为所选专辑的永久链接。

<?php
add_action(\'add_meta_boxes\', \'add_meta_box_album\');
function add_meta_box_album() {
     add_meta_box(\'meta-box-album-id\', \'Album\', \'meta_box_album_callback\', \'page\', \'normal\', \'high\');
}

function meta_box_album_callback($post) {
     $values = get_post_custom($post->ID);
     $mytheme_custom_select = (isset($values[\'mytheme_custom_select\'][0]) && \'\' !== $values[\'mytheme_custom_select\'][0]) ? $values[\'mytheme_custom_select\'][0] : \'\';
     wp_nonce_field(\'my_meta_box_nonce\', \'meta_box_nonce\');
?>
<p>
<label for="">Select album:</label><br>

<? $getAlbums = new WP_Query(array(
    \'post_type\' => \'albums\',
));
?>
<select id="mytheme_custom_select" name="mytheme_custom_select">
    <option value="">Selecht an album...</option>
    <? while ($getAlbums->have_posts()):$getAlbums->the_post(); ?>
        <option
            value="<?php the_title($getAlbums->ID); ?>" <?php selected($mytheme_custom_select, the_title($getAlbums->ID), true); ?>><?php the_title($getAlbums->ID); ?></option>
    <? endwhile; ?>
    <? wp_reset_query(); ?>
</select>

<? }

add_action(\'save_post\', \'cd_meta_box_save\');
function cd_meta_box_save($post_id) {
     if (defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE) return;
     if (!isset($_POST[\'meta_box_nonce\']) || !wp_verify_nonce($_POST[\'meta_box_nonce\'], \'my_meta_box_nonce\')) return;
     if (!current_user_can(\'edit_post\', $post_id)) return;
     $allowed = array(
         \'a\' => array(
             \'href\' => array()
         )
     );
     if (isset($_POST[\'mytheme_custom_select\'])) { // Input var okay.
         update_post_meta($post_id, \'mytheme_custom_select\', sanitize_text_field(wp_unslash($_POST[\'mytheme_custom_select\']))); // Input var okay.
     }
}

2 个回复
最合适的回答,由SO网友:obiPlabon 整理而成

下面是更新后的元框回调函数。我用过get_posts() 而不是WP_Query 像get_posts() 在这种情况下，性能更高，使用更方便。并已删除get_post_custom() 因为它将在您不需要时获取所有自定义元数据。所以，我用get_post_meta(). 希望您的下拉列表现在能像预期的那样工作。

我建议您保存帖子id（相册id）而不是标题

function meta_box_album_callback( $post ) {
    wp_nonce_field( \'my_meta_box_nonce\', \'meta_box_nonce\' );

    $mytheme_custom_select = get_post_meta( $post->ID, \'mytheme_custom_select\', true );
    $albums = get_posts( array(
        \'post_type\'      => \'albums\',
        \'post_status\'    => \'publish\',
        \'posts_per_page\' => -1
    ) );
    ?>

    <p>
        <label for="mytheme_custom_select">Select album:</label><br>
        <select id="mytheme_custom_select" name="mytheme_custom_select">
            <option value="">Selecht an album...</option>
            <?php foreach ( $albums as $album ) : ?>
                <option value="<?php echo esc_attr( $album->post_title ); ?>" <?php selected( $mytheme_custom_select, esc_attr( $album->post_title ) ); ?>><?php echo esc_html( $album->post_title ); ?></option>
            <?php endforeach; ?>
        </select>
    </p>

    <?php
}

SO网友:Zaheer Abbas

上面的代码是正确的，但没有保存下拉选项。因此，您可以遵循以下代码

function meta_box_album_callback( $post ) {
    wp_nonce_field( \'my_meta_box_nonce\', \'meta_box_nonce\' );

    $mytheme_custom_select = get_post_meta( $post->ID, \'mytheme_custom_select\', true);
    $albums = get_posts( array(
        \'post_type\'      => \'albums\',
        \'post_status\'    => \'publish\',
        \'posts_per_page\' => -1
    ) );
    ?>

    <p>
        <label for="mytheme_custom_select">Select album:</label><br>
        <select id="mytheme_custom_select" name="mytheme_custom_select">
            <option value="">Selecht an album...</option>
            <?php foreach ( $albums as $album ) : ?>
                <option value="<?php echo esc_attr( $album->post_title ); ?>" <?php selected( $mytheme_custom_select, esc_attr( $album->post_title ) ); ?>><?php echo esc_html( $album->post_title ); ?></option>
            <?php endforeach; ?>
        </select>
    </p>

    <?php
}

// Here you can save choose value.

$mytheme_custom_select = $_POST[\'mytheme_custom_select\'];
    update_post_meta( $post_id, \'mytheme_custom_select\', $mytheme_custom_select );

结束
标签： custom-field   小码农  

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